<?php dynamic_sidebar('sidebar');
$faetureUser = array(
  'menu'            => 'Sidebar',
  'menu_class'      => 'nav main-menu',
  'echo'            => true,
  'fallback_cb'     => 'wp_page_menu',
  'items_wrap'      => '<ul class="%2$s">%3$s</ul>',
  'walker'          => new themeslug_walker_nav_menu(),
);
wp_nav_menu( $faetureUser );
?>